Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.

R.C.A.
Victor R·27 Universal: This small radio set carries the following specifications: Line voltage rating, 105 to 120 V., D.C.,
or 25 to 133 cycles A.C. Power consumption, 40 W. A feature of this set is the extremely wide tuning range of 540 to 1,700
kc. The left-hand knob is a combined volume control and power- switch; the station selector is at the right. If the set
does not work within a minute, reverse the position of the line plug in the socket. This particular type of set should be
so positioned as to permit full ventilation at all times.

Philco 53 Universal Compact: To obtain maximum sensitivity through the use of the 30 ft. of antenna wire furnished with
the set, it will be necessary to adjust the antenna compensating condenser, the L.F. compensating condenser and the sensitivity
condenser in the following manner; unroll the 30 ft. of antenna wire to its full length (do not connect it to another aerial
or ground while the following adjustments are being made).

These schematics, tuning instructions, and other data are reproduced from my collection
of vintage radio and electronics magazines. As back in the era, similar schematic and service
info was available for purchase from sources such as
SAMS Photofacts, but these printings
were a no-cost bonus for readers. There are 220 Radio Service Data Sheets as of
February 2, 2018.

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas
and reference material while performing my work as an RF system and circuit design engineer.
The Internet was still largely an unknown entity at the time and not much was available
in the form of WYSIWYG
...

All trademarks, copyrights, patents, and other rights of ownership to images and text
used on the RF Cafe website are hereby acknowledged.